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DENTAL ENGINE,- No. 356,809. Patented Feb. 1, 1887.

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. A, WEBER.

DENTAL ENGINE.

NO 356,809, Patented Feb. 1, 1887.

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AUGUST WEBER, or new YORK, n. Y.

DENTAL ENGlNE.

SPEBIFZCATIOBT forming part of Letters Patent No. 356,809, dated February 1, 1887.

To all whom it may concern.-

Be it known that I, Aneos'r WEBER, of the city and State of New York, have invented an Improvement in Dental Engines, of which ing the tension of the belt Without straining the some unnecessarily.

In the drawings, Figure 1 is an elevation of the engine with part of the standard removed. Fig. 2 is an elevation of the flywheel and base at right angles to Fig. 1. Fig. 3 is a. yer

tical section at the upper part of the standardl Fig. at is adeiuched elevation and partial section of the exterior tube of the standard at the upper part. Fig. 5 is a side elevation showing the pulley at the end of the hand 5 piece and the joints at the ends of the radius Fig. 6is an elevation of the pulleys bar. upon the headpiece at right angles to Fig. 5. Fig. 7 is a scotiouof the pulleys at the joint of the radiushars. Fig. 5 is a section of one of the radiushars and an elevation of the sup porting-awn for tho'second radius-bar. Fig. 2) is a side view of the treailleiulerum and section of the ireadle and ease, and Fig. 10 is a section at right angles to Fly. 9.

The base or foot A is usually made of three arms extending out from the bottom B of the standard, and at C the stand ard is made double to receive between the two side bars oithe standard the ily-n'heel D, and upon the top of the port-ion (J is the tubular standard that carries the other parts of the dental engine. I prefer to provide the hooks 2 2 at the upper part, 0,

difficulties I makeuse of the huifeedged pivots 6 upon the under side of the treadle F. These are preferably of steel, attached by the screw 7, and upon the base A are the open Vshaped hearings 8 for the knife-edged pivots. These are easily lcept clean, and there is very little wear upon them and they do not need to be oiled.

The flywheel D is weighted at one side, as at 9, so that the crank i only occupy the proper position for starting when the parts are at rest- The tubular standard E is a fixture, and into the top of the same is passed the bottom of the tubular extension G, that allows the parts of the standard to be separated for transportation.

Within the tubular extension G is a sliding tube, E, that is acted upon by a spring, 9, to raise the said tube H and maintain the proper tension upon the belt I; but to prevent the tension being too great I slot the tube G, as seen in 4L, and provide lateral branch slots 10, so that the screw 11, that is passed into the tube "H, can he turned into either of these branch slots when the proper tension is given to the belt.

. The pivotpin 12 is screwed into the headpiece K, and passes freely into the upper end oi the tube B, so that said head-piece and the radius-liars pivoted thereto can be turned around upon the pivotpin 12 into any desired position, and there are hearing-disks 14: 15 at the bottom end of the head-piece K and up per end of the tube H, respectively, with a disk of leather between them for producing a uniformity of frictional contact to prevent the head-piece and radiushars swingi ng too freely.

The upper end of the headpiece K is forked, and through it passes the pivot-pin 16, that connects the first radius-bar, L, to such headpiece, and there is asector, 17, extending down from the first radius-bar, and passing through a slot in headpiece K, and this sector-bar may he clamped by the screw 18 Whenever the radius-bar has been moved to the desired position in which it may require to he fixed; but usually th e sector is permitted to move t-h rough the slot in the head-piece K, and a friction is applied to the edge of the sector by means of a spring, 20, within the heed-piece K and in line with the pivot-pin i2, and this pivotpin may be screwed into the head-piece K to com ICC press the spring more or less, and it is preferable to apply a piece of leather, 21, between the spring 20 and the edge of the sector 17.

The pulleys M, over which the belt I passes, are upon the ends of the pivot-pin 16, and they are held in place by the nuts 22, screwed upon the ends of such pivot'pin.

The first radius-bar, L, beyond the sector 17, is preferably tubular, and into its open end is received the pin 24 of the joint-piece 25, and this tubular radius-bar is split longitudinally and indented, as at 26, to form a spring, and the pin 24 is formed with a neck, as seen in Fig. 5, so that the pin may be pushed into or pulled out of the radius'bar L, and the indented spring portion will serve as a detainer, to prevent the parts separating too easily; but at the same time thejoint-piece 25 can be turned around freely within the end of the radiusbar to whatever extent is necessary.

The joiiit 25 is forked at the end and has through it a pin, 27, and this pin passes through the back end of the second radius-bar, P, and 28 are pulleys around the projecting ends of the pin 27, and 29 are screws to hold the pulleys in place. The endless belt I passes also over these pulleys 28.

At the end of the radius-bar I a hand-piece having a drill or other tool or dental plugger is connected, as at Q. This hand-piece, however, does not form any necessary part of my invention, but is introduced to illustrate the tool with which my improved dental engine may be used.

49 is the driving-pulley for the tool, and 30 the guide-pulleys for the endless belt I. At 31 the stock of the hand-piece is jointed to the pivotal pin 32, that enters the open end of the second radiusbar, P, and upon which pivotal pin the hand-piece may be turned around into any desired position without becoming detached from the radius-oar. The tube of the radius-bar is slotted and indented, as seen in Fig. 6, for holding the pivotal pin 32 within the end of the radius-bar, and for allowing the parts to be separated by pulling upon the pivotal pin with the necessary force.

My dental engine is easily constructed, cheap, simple, durable, and efficient, and it is to be understood that the jointed radius- ]oars can be turned into any desired position relatively to each other and incline more or less and swung around upon the tubular standard, so as to accommodate the various positions in which the hand-piece may be placed when performing the work required of the tool or plugger.

The finger 36 is made of sheet metal, bent up at one end to form an eye that surrounds the first radius-bar, L, near the sector 17, and it extends out at one side, as seen in Fig. 8,

and terminates as a hook, so that the second radius-bar, P, and the adjacent portions of the endless belt I may be laid into the recess of thehook, so as to support the hand-piece when not in use and to allow the same to be speedily lifted out and set in operation.

I claim as my invention 1. The combination, in a dental engine, of the tubular standard E, the tubular extension G, sliding tube H, spring 9, and the screw 11, received into one of the branches of the longitudinal slot in the tubular extension, substantially as set forth.

2. The head-piece K, the radius-bar L, and the pivot-pin 16, in combination with the sector 17, spring 20, friction-block 21', and pivotpin 12, having a screw that serves also to vary the pressure of the spring, substantially as set forth.

3. The combination, in a dental engine, of a tubular standard, a head-piece and pivotpin for the same, two radius-bars connected together, pulleys upon the pivot-pins of the respective joints, an endless driving-belt passing around the flywheel and over the respective pulleys, and a joint-pin, 25, passing into the open tubular end of the first radius-bar for allowing the second radius-bar to be swung upon such joint-pin in adjusting the radiusbars to the proper positions when operating the tool of the hand-piece, substantially as set forth.

4.. The tubular radius-bars slotted longitudinally and indented, in combination with the joint-pins having necks upon them and adapted to be inserted into the open tubular ends of the respective radiusbars and held therein by the indentation of the spring, substantially as set forth.

5. The combination, with the radius-bars hinged together and the respective pulleys and driving-belt, of the supporting-finger clamped upon the first radiusbar and having a hookedshaped end for receiving the second radiusbar, substantially as set forth.

Signed by me this 4th day of June, A. D. 1886.

AUGUST WEBER.

Witnesses:

GEO. T. PINOKNEY, WILLIAM G. MOTT.

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